Electrophotographic image forming apparatus

摘要

An image forming apparatus for forming an image on a recording material; an image bearing member; a rotatable developing rotary; a developing unit mounting portion, in the developing rotary, for detachably mounting a developing unit for developing an electrostatic latent image formed on the image bearing member; and a controller for executing, after exchange of the developing unit, an intermittent rotating operation wherein the developing rotary is repeatedly rotated and stopped.